Package org.apache.jackrabbit.commons.observation

Class ListenerTracker

java.lang.Object

org.apache.jackrabbit.commons.observation.ListenerTracker

public class ListenerTracker
extends Object

Tracks event deliveries to an event listener and the way the listener processes the events. The collected information is made available through the EventListenerMBean interface.

Field Summary

Fields

Modifier and Type	Field	Description
protected Exception	initStackTrace

Constructor Summary

Constructors

Constructor	Description
ListenerTracker(EventListener listener, int eventTypes, String absPath, boolean isDeep, String[] uuid, String[] nodeTypeName, boolean noLocal)

Method Summary

Modifier and Type	Method	Description
protected void	afterEventDelivery()	Called just after the EventListener.onEvent(EventIterator) method has been called (even if the call threw an exception).
protected void	beforeEventDelivery()	Called just before the EventListener.onEvent(EventIterator) method is called.
EventListenerMBean	getListenerMBean()
EventListener	getTrackedListener()
void	recordOneSecond()	Records the number of measured values over the past second and resets the counter.
void	recordProducerTime(long time, TimeUnit unit)	Record additional producer time spent outside of the listeners, e.g.
void	recordQueueLength(long length)	Applications should call this to report the current queue length.
void	recordQueueLength(long length, long headTimestamp)	Applications should call this to report the current queue length when an item is removed from the queue.
String	toString()
protected void	warn(String message)	Called to log a deprecation warning about the detected behavior of the decorated listener.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

initStackTrace

protected final Exception initStackTrace

Constructor Detail

ListenerTracker

public ListenerTracker(EventListener listener,
                       int eventTypes,
                       String absPath,
                       boolean isDeep,
                       String[] uuid,
                       String[] nodeTypeName,
                       boolean noLocal)

Method Detail

warn

protected void warn(String message)

Called to log a deprecation warning about the detected behavior of the decorated listener. Subclasses should override this method that by default does nothing.

Parameters:

message - warning message

beforeEventDelivery

protected void beforeEventDelivery()

Called just before the EventListener.onEvent(EventIterator) method is called. The default implementation of this method does nothing, but subclasses can override it to add custom processing.

afterEventDelivery

protected void afterEventDelivery()

Called just after the EventListener.onEvent(EventIterator) method has been called (even if the call threw an exception). The default implementation of this method does nothing, but subclasses can override it to add custom processing.

recordQueueLength

public void recordQueueLength(long length)

Applications should call this to report the current queue length.

Parameters:

length -

recordQueueLength

public void recordQueueLength(long length,
                              long headTimestamp)

Applications should call this to report the current queue length when an item is removed from the queue.

Parameters:

length - the length of the queue after the item was removed.

headTimestamp - the time in milliseconds when the head item was created and put into the queue.

recordOneSecond

public void recordOneSecond()

Records the number of measured values over the past second and resets the counter. This method should be scheduled to be called once per second.

recordProducerTime

public void recordProducerTime(long time,
                               TimeUnit unit)

Record additional producer time spent outside of the listeners, e.g. before onEvent() is called.

Parameters:

time - the amount of time.

unit - the time unit.

getTrackedListener

public EventListener getTrackedListener()

getListenerMBean

public EventListenerMBean getListenerMBean()

toString

public String toString()

Overrides:

toString in class Object